Editorial Review This USB/Wireless Relay Module allows computer control switching of external devices by using the USB port of your computer! Meanwhile, It? has a wireless extension port, can work with XBEE or Bluetooth Bee or Wifly Module, which mean now you can control your device by zigbee or Bluetooth or WiFi ! The TOSR04-T module can powered by USB bus or DC power and provides four volt free contact relay outputs with a current rating of up to 10 Amp each. It also has a DS18B20 temperature sensor port. You can use it make your thermostat or any other similar application by yourself.